Spring-brake for gears.



E. E. PHINNEY.

SPRING BRAKE FOR GEARS.

APPLICATION FILED OCT. 27. 19M.

Patented Dec.12,1916.

UNITED STATES PATENT OFFICE.

I EDGAR E. PHINNEY, OF NEW YORK, N. Y., ASSIGNOR TO MONROE CALCULATING MACHINE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

SPRING-BRAKE EUR GEARS.

Specification of Letters Patent.

Patented Dec. 12, 1916.

Application filed October 27, 1914. Serial No. 868,869.

T0 all whom it may concern.

Be it knownthat I, EDGAR E. PHINNEY, a citizen of the United States, resident of New York, in the county of New York and State of New York, have made a certain new and useful Invention in Spring-Brakes for Gears; and I declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it appertains to make and use the invention, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Figure 1 is a top plan View partly in section, showing the invention, as applied. Fig. 2 is a sect-ion on the line 2-2, Fig. 1. The invention has relation to improvements in calculating machines of the type shown in Letters Patent ,No. 1,080,245, dated December 2, 1913, having for its object the provision of an improved check spring or brake designed mainly for retarding the movement of and holding in position the intermediate gears of such machines.

The invention consists in the novel construction and combinations of parts, as hereinafter set forth.

In the accompanying drawings, illustrating the invention, the numeral 12 designates the intermediate gears, 3 designates a longitudinal rod having bearings in the end walls of the machine, and 4 is a coiled spring, fitting over and covering said red, the rod acting as a stifi ener for the spring to hold it up to the gears, the coils of the spring having engagement with the points or ends of the teeth.

The rod is hollowed out or recessed at 6, 6, opposite-each of said gears, to allow the coils of the spring to yield in the rota.- tion of the gears, the yielding movement being substantially in the planes of the coils and at right angles to the longitudinal axis of the spring. The gears are in this way allowed to turn with proper freedom, and the rod is provided with a series of collars or projections 7, 7, between the recesses and having engagement with the inside of, the coils of the spring, in order to .provide the proper amount of resistance to movement of the gears.

The coils of the spring are arranged close together, in substantial contact with each plished in the present case by locating the collars or projections of the stiffener rod midway between the intermediate 'gears, whereby yielding of the spring through rotation of one intermediate gear will not slacken the spring pressure upon the ad jacent gear or gears, the yielding action of the spring being localized to the particular gear being turned.

The diameter of the coils of the spring has such relation to the diameter of the intermediate gears that the portion of the coils engaging the gears shall fit in between the teeth of the gears and shall engage the inner sides of the points or ends of the teeth. of the gears to a sufiicient extent to hold the gears properly. As each gear is turned, tooth by tooth, the particular portion of the spring affected will yield and cause distortion of all the coils thereof between adjacent collars or projections of the rod to a decreasing extent toward said collars, the elastic action of all of the distorted coils causing the center coil acted upon to react and engage the next or succeeding teeth.

- It is designed by this invention to provide a spring brake or check practically noiseless in its working, having a greater holding power and yet ofi'ering less resistance to the turning of the gears or wheels than in other devices for the purpose.

This device also eliminates a great number of parts used in the old machine.

In order to adjust the pressure of the coiled spring upon the gears, suitable means are provided. being preferably end plates 8, 8, pivoted to end or partition walls of the machine at 9, 9, and wherein the longitudinal rod has end bearings at 10, 10, said rod working in slots 11, 11, of said walls.

A set screw 14 is threaded into a post 15 of each said wall of the machine, and has engagement with an eccentric extension 16 ofeach plate, to move the plate upon its pivot and thereby to adjust the longitudi nal rod and the coiled spring thereupon bodily toward or away from the gears. A very slight turn of the adjusting screw is needed, owing to the delicate contact of the spring with the gears. A headed guide post 17 is carried by each end plate and has engagement with a' slot 18 of each end plate, and a locking screw 19 is employed with each adjusting screw. What I claim is:

1. In a yieldable check device, a member having a rod provided with projections spaced apart from each other, a coiled spring surrounding said rod and having the interior surfaces of certain of its coils, en-

gaged by'said projections, and a member having engagement with the exterior surfaces of the 60-118 of said springs located between sald pro ections, one of said members being movable with relation to the other member.

2. In a yieldable check device for a ma chine having a gear wheel, a rodsupported by said machine and provided with pro ections spaced apart from 'each' other, and a coiled spring surrounding said rod and having the interior surfaces of certain of its coils engaged said projections, 'said gear wheel having engagement with the exterior surfaces of the coils of said spring located between said projections,

3. In a yieldable-check device for a machine having gear wheels, a rod supported by said machine and provided with projections spaced apart from each other, a coiled spring surrounding said rod and having its coils laterally in substantial contact with each other and the interior surfaces of cer-.

tain of its coils engaged by said projections, said gear Wheels having engagement with the exterior surfaces of the coils of said spring located between said projections.

4:. In a yieldable check device for a machine having gear wheels, a rod having end hearings in the frame of said machine and provided with pro ections spaced apart from reoaeee each other and recesses between said projections, a coiled spring surrounding said rod and having its coils laterally in substantial contactwith each other and the interior surfaces of certain of its coils engaged by said projections, said gear wheel's having engage- I ment withthe exterior surfaces of the coils of said spring located between said projections and opposite said recesses.

5. In a yieldable check device for a machine having gear wheels, a rod having end hearings in the frame of said machine and provided with projections spaced apart from each other, a coiled spring surrounding said rod andhaving the interior surfaces of -certain of its coils engaged by said projections, said gear wheels having engagement with the exterior surfaces of the coils of said spring located between said projections, and

means for adjusting said rod and said spring bodily toward and away from said gear wheels.

In a yieldable check-device for a machine having gear wheels, a rod provided with projections spaced apart from each other and recesses between said projections, a coiled spring surrounding said rod and having its coils laterally in substantial contact with each other and the interior surfaces of certain of its coils engaged by said projections, said gear wheels having engagement with the exterior surfaces of the coils EDGAR E. PHINNEY.

' Witnesses:

CHAS. CLOSE, G. WILLIAMS. 

